Cerebral Venous Thrombosis Diagnosis and Treatment

Pathophysiology

Cerebral venous thrombosis (CVT) occurs due to thrombosis in the cerebral veins or dural sinuses, causing impaired venous drainage and increased intracranial pressure, while arterial stroke results from occlusion or rupture of cerebral arteries 1, 2
CVT represents only 0.5-1% of all strokes, making it a relatively uncommon form of cerebrovascular disease 2

Headache is the most prominent symptom in CVT, typically diffuse and progressively worsening over days to weeks, whereas headache is less common in arterial stroke 1
CVT has a more subacute presentation with slower symptom progression, with only 37% presenting acutely, 56% subacutely, and 7% chronically 3
Seizures occur in approximately 40% of CVT patients, which is significantly higher than in arterial stroke 1, 3
Bilateral brain involvement is more common in CVT, particularly with deep venous system thrombosis, which can cause bilateral thalamic involvement and altered consciousness without focal signs 1, 3

CVT predominantly affects younger individuals, with 78% of cases occurring in patients under 50 years of age 2, 4
Women are more frequently affected than men, particularly those taking oral contraceptives or who are pregnant/postpartum 4

CVT is strongly associated with prothrombotic conditions including inherited thrombophilias, such as protein C deficiency, protein S deficiency, antithrombin III deficiency, and factor V Leiden 2, 4
Other significant risk factors include oral contraceptive use, pregnancy, puerperium, malignancy, and inflammatory conditions 2, 4

Non-contrast CT has limited sensitivity for CVT, whereas MRI with MR venography is the preferred diagnostic modality for CVT, showing both venous occlusion and parenchymal changes 5, 4
D-dimer can be helpful in excluding CVT when negative, though it has poor specificity 3, 6

CVT may show hemorrhagic infarction that crosses arterial boundaries, which is uncommon in arterial stroke 5
The "empty delta" sign on contrast-enhanced CT is characteristic of CVT 5
Venous infarcts are often hemorrhagic and located near venous sinuses, unlike arterial strokes which follow arterial territories 5

Anticoagulation is the mainstay of treatment for CVT, even in the presence of hemorrhagic lesions, which contrasts with arterial stroke where anticoagulation may be contraindicated with hemorrhage 7

Delayed diagnosis is common in CVT due to its variable presentation and slower progression, with a median 7 days from symptom onset to diagnosis 3
CVT may be misdiagnosed as idiopathic intracranial hypertension, especially when presenting with isolated headache and papilledema 1, 3
Normal non-contrast CT does not exclude CVT, and further imaging with CTV or MRV should be pursued when clinical suspicion is high 5

Altered mental status, especially with deep venous system involvement, can occur without obvious focal neurological abnormalities, according to the American Heart Association 8
Non-contrast CT has limited sensitivity (abnormal in only 30% of cases) and may show hyperdensity of cortical vein or dural sinus in acute phase, as noted by the American College of Radiology 9
MRI with MR venography is more sensitive and is the preferred diagnostic modality, showing both venous occlusion and parenchymal changes, as recommended by the American Stroke Association 9
The comparison of CT vs MRI for CVST diagnosis shows that MRI+MRV has better visualization of superficial and deep venous systems, better definition of brain parenchyma, and early detection of ischemic changes, according to the American College of Radiology 9, 10

Intravenous heparin or subcutaneous low molecular weight heparin is recommended initially for CVST treatment, as suggested by the American College of Cardiology 11
For patients with severe mass effect or intracranial hemorrhage with neurological deterioration, endovascular therapy may be considered, and decompressive hemicraniectomy may be life-saving in severe cases, according to the American Heart Association 11